<template>
  <el-menu ref="menuRef" :default-active="activeMenu" mode="horizontal" @select="handleSelect">
    <template v-for="(item, index) in topMenus">
      <el-menu-item :style="{ '--theme': theme }" :index="item.path" :key="index" v-if="index < visibleNumber">
        <svg-icon
          :icon-class="item.meta.icon"
          :style="{ color: sideTheme === 'theme-dark' ? variables.logoTitleColor : '' }" />
        {{ item.meta.title }}
      </el-menu-item>
    </template>

    <!-- 顶部菜单超出数量折叠 -->
    <el-submenu :style="{ '--theme': theme }" index="more" v-if="topMenus.length > visibleNumber">
      <template slot="title">更多菜单</template>
      <template v-for="(item, index) in topMenus">
        <el-menu-item :index="item.path" :key="index" v-if="index >= visibleNumber">
          <svg-icon :icon-class="item.meta.icon" />
          {{ item.meta.title }}
        </el-menu-item>
      </template>
    </el-submenu>
  </el-menu>
</template>

<script>
import { constantRoutes } from '@/router'
import variables from '@/assets/styles/variables.scss'

// 隐藏侧边栏路由
const hideList = ['/index', '/user/profile']

export default {
  props: {
    sideTheme: {
      type: String,
      default() {
        return ''
      },
    },
  },
  data() {
    return {
      // 顶部栏初始数
      visibleNumber: 8,
      // 当前激活菜单的 index
      currentIndex: undefined,
      path: '',
    }
  },
  computed: {
    theme() {
      return this.$store.state.settings.theme
    },
    variables() {
      return variables
    },
    // 顶部显示菜单
    topMenus() {
      let topMenus = []
      this.routers.map((menu) => {
        if (menu.hidden !== true) {
          // 兼容顶部栏一级菜单内部跳转
          if (menu.path === '/') {
            topMenus.push(menu.children[0])
          } else {
            topMenus.push(menu)
          }
        }
      })
      return topMenus
    },
    // 所有的路由信息
    routers() {
      return this.$store.state.permission.topbarRouters
    },
    // 设置子路由
    childrenMenus() {
      var childrenMenus = []
      this.routers.map((router) => {
        for (let index in router.children) {
          let item = router.children[index]
          if (item.parentPath === undefined) {
            if (router.path === '/') {
              item.path = '/' + item.path
            } else {
              if (!this.ishttp(item.path)) {
                item.path = router.path + '/' + item.path
              }
            }
            item.parentPath = router.path
          }
          childrenMenus.push(item)
        }
      })
      return constantRoutes.concat(childrenMenus)
    },
    // 默认激活的菜单
    activeMenu() {
      const path = this.$route.path
      let activePath = path
      if (path !== undefined && path.lastIndexOf('/') > 0 && hideList.indexOf(path) === -1) {
        const tmpPath = path.substring(1, path.length)
        activePath = '/' + tmpPath.substring(0, tmpPath.indexOf('/'))

        let pathArr = tmpPath.split('/')
        if (pathArr.length > 2) {
          activePath = `/${pathArr[0]}`
          if (tmpPath.indexOf('system') < 0) {
            activePath = `/${pathArr[0]}/${pathArr[1]}`
          }
        }
        this.$store.dispatch('app/toggleSideBarHide', false)
      } else if (!this.$route.children) {
        activePath = path
        this.$store.dispatch('app/toggleSideBarHide', true)
      }
      this.activeRoutes(activePath)   
      return activePath
    },
  },
  beforeMount() {
    window.addEventListener('resize', this.setVisibleNumber)
  },
  beforeDestroy() {
    window.removeEventListener('resize', this.setVisibleNumber)
  },
  mounted() {
    this.setVisibleNumber()
  },
  methods: {
    // 根据宽度计算设置显示栏数
    setVisibleNumber() {
      const width = document.body.getBoundingClientRect().width / 2
      this.visibleNumber = parseInt(width / 85)
    },
    // 菜单选择事件
    handleSelect(key, keyPath) {
      this.currentIndex = key
      const route = this.routers.find((item) => item.path === key)
      if (this.ishttp(key)) {
        this.$refs.menuRef.activeIndex=this.activeMenu
        // http(s):// 路径新窗口打开
        window.open(key, '_blank')
      } else if (!route || !route.children) {
        // 没有子路由路径内部打开
        this.$router.push({ path: key })
        this.$store.dispatch('app/toggleSideBarHide', true)
      } else {
        this.path = key
        // 显示左侧联动菜单
        this.activeRoutes(key)
        this.$store.dispatch('app/toggleSideBarHide', false)

        let routeChildren = route.children
        if (routeChildren && routeChildren[0].children) {
          this.$router.push({ path: routeChildren[0].path + '/' + routeChildren[0].children[0].path })
        } else {
          this.$router.push({ path: route.children[0].path })
        }
      }
    },
    // 当前激活的路由
    activeRoutes(key) {
      var routes = []
      if (this.childrenMenus && this.childrenMenus.length > 0) {
        this.childrenMenus.map((item) => {
          if (key == item.parentPath || (key == 'index' && '' == item.path)) {
            routes.push(item)
          }
        })
      }
      if (routes.length > 0) {
        this.$store.commit('SET_SIDEBAR_ROUTERS', routes)
      }
    },
    ishttp(url) {
      return url.indexOf('http://') !== -1 || url.indexOf('https://') !== -1
    },
  },
}
</script>

<style lang="scss">
.topmenu-container.el-menu--horizontal > .el-menu-item {
  float: left;
  height: 50px;
  line-height: 50px;
  //color: rgba(0, 0, 0, .7);
  padding: 0 5px !important;
  margin: 0 10px !important;
}

.topmenu-container.el-menu--horizontal > .el-menu-item {
  &:hover {
    color: #{'var(--theme)'} !important;
  }
}

.topmenu-container.el-menu--horizontal > .el-menu-item.is-active,
.el-menu--horizontal > .el-submenu.is-active .el-submenu__title {
  border-bottom: 2px solid #{'var(--theme)'};
  color: #{'var(--theme)'} !important;
}

/* submenu item */
.topmenu-container.el-menu--horizontal > .el-submenu .el-submenu__title {
  float: left;
  height: 50px !important;
  line-height: 50px !important;
  color: #999093 !important;
  padding: 0 5px !important;
  margin: 0 10px !important;
}
.screenfull-svg {
  display: inline-block;
  cursor: pointer;
  fill: #5a5e66;
  width: 20px;
  height: 20px;
  vertical-align: 10px;
}
</style>
